22 Nov 2017 --- Apple allergens could be an effective option for treating apple allergy, a study from the Medical University of Vienna has suggested. The food allergy, which is related to birch pollen, is a very common attendant phenomenon associated with birch pollen allergy – around 70 percent of those with a birch pollen allergy are also allergic to apples, which amounts to around 280,000 people in Austria.